First appearance: Superboy (vol. 4) #0 (October 1994)
Joined the team in: Superboy (vol. 4) #13 (March 1995)
He may have made his live-action debut on The Flash TV series but initially was set to appear in the first Suicide Squad film. Ultimately, he was was replaced with Killer Croc in the film which has left him open to appear in the future. Perhaps even simply just as a cameo which features the character as one of Belle Reve’s inmates?